Add basic edit ldap auth test & actually fix #16252 (#16465) (#16495)

Backport #16465

One of the reasons why #16447 was needed and why #16268 was needed in
the first place was because it appears that editing ldap configuration
doesn't get tested.

This PR therefore adds a basic test that will run the edit pipeline.

In doing so it's now clear that #16447 and #16268 aren't actually
solving #16252. It turns out that what actually happens is that is that
the bytes are actually double encoded.

This PR now changes the json unmarshal wrapper to handle this double
encode.

Fix #16252

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>

3 files changed, 87 insertions, 13 deletions

diff --git a/integrations/auth_ldap_test.go b/integrations/auth_ldap_test.go
index 4d82c092e..59f519512 100644
--- a/integrations/auth_ldap_test.go
+++ b/integrations/auth_ldap_test.go
@@ -144,6 +144,60 @@ func TestLDAPUserSignin(t *testing.T) {
 	assert.Equal(t, u.Email, htmlDoc.Find(`label[for="email"]`).Siblings().First().Text())
 }
 
+func TestLDAPAuthChange(t *testing.T) {
+	defer prepareTestEnv(t)()
+	addAuthSourceLDAP(t, "")
+
+	session := loginUser(t, "user1")
+	req := NewRequest(t, "GET", "/admin/auths")
+	resp := session.MakeRequest(t, req, http.StatusOK)
+	doc := NewHTMLParser(t, resp.Body)
+	href, exists := doc.Find("table.table td a").Attr("href")
+	if !exists {
+		assert.True(t, exists, "No authentication source found")
+		return
+	}
+
+	req = NewRequest(t, "GET", href)
+	resp = session.MakeRequest(t, req, http.StatusOK)
+	doc = NewHTMLParser(t, resp.Body)
+	csrf := doc.GetCSRF()
+	host, _ := doc.Find(`input[name="host"]`).Attr("value")
+	assert.Equal(t, host, getLDAPServerHost())
+	binddn, _ := doc.Find(`input[name="bind_dn"]`).Attr("value")
+	assert.Equal(t, binddn, "uid=gitea,ou=service,dc=planetexpress,dc=com")
+
+	req = NewRequestWithValues(t, "POST", href, map[string]string{
+		"_csrf":                    csrf,
+		"type":                     "2",
+		"name":                     "ldap",
+		"host":                     getLDAPServerHost(),
+		"port":                     "389",
+		"bind_dn":                  "uid=gitea,ou=service,dc=planetexpress,dc=com",
+		"bind_password":            "password",
+		"user_base":                "ou=people,dc=planetexpress,dc=com",
+		"filter":                   "(&(objectClass=inetOrgPerson)(memberOf=cn=git,ou=people,dc=planetexpress,dc=com)(uid=%s))",
+		"admin_filter":             "(memberOf=cn=admin_staff,ou=people,dc=planetexpress,dc=com)",
+		"restricted_filter":        "(uid=leela)",
+		"attribute_username":       "uid",
+		"attribute_name":           "givenName",
+		"attribute_surname":        "sn",
+		"attribute_mail":           "mail",
+		"attribute_ssh_public_key": "",
+		"is_sync_enabled":          "on",
+		"is_active":                "on",
+	})
+	session.MakeRequest(t, req, http.StatusFound)
+
+	req = NewRequest(t, "GET", href)
+	resp = session.MakeRequest(t, req, http.StatusOK)
+	doc = NewHTMLParser(t, resp.Body)
+	host, _ = doc.Find(`input[name="host"]`).Attr("value")
+	assert.Equal(t, host, getLDAPServerHost())
+	binddn, _ = doc.Find(`input[name="bind_dn"]`).Attr("value")
+	assert.Equal(t, binddn, "uid=gitea,ou=service,dc=planetexpress,dc=com")
+}
+
 func TestLDAPUserSync(t *testing.T) {
 	if skipLDAPTests() {
 		t.Skip()
diff --git a/models/login_source.go b/models/login_source.go
index 23778eedc..a8b569fff 100644
--- a/models/login_source.go
+++ b/models/login_source.go
@@ -7,6 +7,7 @@ package models
 
 import (
 	"crypto/tls"
+	"encoding/binary"
 	"errors"
 	"fmt"
 	"net/smtp"
@@ -69,11 +70,30 @@ var (
 	_ convert.Conversion = &SSPIConfig{}
 )
 
-// jsonUnmarshalIgnoreErroneousBOM - due to a bug in xorm (see https://gitea.com/xorm/xorm/pulls/1957) - it's
-// possible that a Blob may gain an unwanted prefix of 0xff 0xfe.
-func jsonUnmarshalIgnoreErroneousBOM(bs []byte, v interface{}) error {
+// jsonUnmarshalHandleDoubleEncode - due to a bug in xorm (see https://gitea.com/xorm/xorm/pulls/1957) - it's
+// possible that a Blob may be double encoded or gain an unwanted prefix of 0xff 0xfe.
+func jsonUnmarshalHandleDoubleEncode(bs []byte, v interface{}) error {
 	json := jsoniter.ConfigCompatibleWithStandardLibrary
 	err := json.Unmarshal(bs, v)
+	if err != nil {
+		ok := true
+		rs := []byte{}
+		temp := make([]byte, 2)
+		for _, rn := range string(bs) {
+			if rn > 0xffff {
+				ok = false
+				break
+			}
+			binary.LittleEndian.PutUint16(temp, uint16(rn))
+			rs = append(rs, temp...)
+		}
+		if ok {
+			if rs[0] == 0xff && rs[1] == 0xfe {
+				rs = rs[2:]
+			}
+			err = json.Unmarshal(rs, v)
+		}
+	}
 	if err != nil && len(bs) > 2 && bs[0] == 0xff && bs[1] == 0xfe {
 		err = json.Unmarshal(bs[2:], v)
 	}
@@ -87,7 +107,7 @@ type LDAPConfig struct {
 
 // FromDB fills up a LDAPConfig from serialized format.
 func (cfg *LDAPConfig) FromDB(bs []byte) error {
-	return jsonUnmarshalIgnoreErroneousBOM(bs, &cfg)
+	return jsonUnmarshalHandleDoubleEncode(bs, &cfg)
 }
 
 // ToDB exports a LDAPConfig to a serialized format.
@@ -114,7 +134,7 @@ type SMTPConfig struct {
 
 // FromDB fills up an SMTPConfig from serialized format.
 func (cfg *SMTPConfig) FromDB(bs []byte) error {
-	return jsonUnmarshalIgnoreErroneousBOM(bs, cfg)
+	return jsonUnmarshalHandleDoubleEncode(bs, cfg)
 }
 
 // ToDB exports an SMTPConfig to a serialized format.
@@ -131,7 +151,7 @@ type PAMConfig struct {
 
 // FromDB fills up a PAMConfig from serialized format.
 func (cfg *PAMConfig) FromDB(bs []byte) error {
-	return jsonUnmarshalIgnoreErroneousBOM(bs, cfg)
+	return jsonUnmarshalHandleDoubleEncode(bs, cfg)
 }
 
 // ToDB exports a PAMConfig to a serialized format.
@@ -152,7 +172,7 @@ type OAuth2Config struct {
 
 // FromDB fills up an OAuth2Config from serialized format.
 func (cfg *OAuth2Config) FromDB(bs []byte) error {
-	return jsonUnmarshalIgnoreErroneousBOM(bs, cfg)
+	return jsonUnmarshalHandleDoubleEncode(bs, cfg)
 }
 
 // ToDB exports an SMTPConfig to a serialized format.
@@ -172,7 +192,7 @@ type SSPIConfig struct {
 
 // FromDB fills up an SSPIConfig from serialized format.
 func (cfg *SSPIConfig) FromDB(bs []byte) error {
-	return jsonUnmarshalIgnoreErroneousBOM(bs, cfg)
+	return jsonUnmarshalHandleDoubleEncode(bs, cfg)
 }
 
 // ToDB exports an SSPIConfig to a serialized format.
diff --git a/models/repo_unit.go b/models/repo_unit.go
index f6c83d486..8953362c9 100644
--- a/models/repo_unit.go
+++ b/models/repo_unit.go
@@ -28,7 +28,7 @@ type UnitConfig struct{}
 
 // FromDB fills up a UnitConfig from serialized format.
 func (cfg *UnitConfig) FromDB(bs []byte) error {
-	return jsonUnmarshalIgnoreErroneousBOM(bs, &cfg)
+	return jsonUnmarshalHandleDoubleEncode(bs, &cfg)
 }
 
 // ToDB exports a UnitConfig to a serialized format.
@@ -44,7 +44,7 @@ type ExternalWikiConfig struct {
 
 // FromDB fills up a ExternalWikiConfig from serialized format.
 func (cfg *ExternalWikiConfig) FromDB(bs []byte) error {
-	return jsonUnmarshalIgnoreErroneousBOM(bs, &cfg)
+	return jsonUnmarshalHandleDoubleEncode(bs, &cfg)
 }
 
 // ToDB exports a ExternalWikiConfig to a serialized format.
@@ -62,7 +62,7 @@ type ExternalTrackerConfig struct {
 
 // FromDB fills up a ExternalTrackerConfig from serialized format.
 func (cfg *ExternalTrackerConfig) FromDB(bs []byte) error {
-	return jsonUnmarshalIgnoreErroneousBOM(bs, &cfg)
+	return jsonUnmarshalHandleDoubleEncode(bs, &cfg)
 }
 
 // ToDB exports a ExternalTrackerConfig to a serialized format.
@@ -80,7 +80,7 @@ type IssuesConfig struct {
 
 // FromDB fills up a IssuesConfig from serialized format.
 func (cfg *IssuesConfig) FromDB(bs []byte) error {
-	return jsonUnmarshalIgnoreErroneousBOM(bs, &cfg)
+	return jsonUnmarshalHandleDoubleEncode(bs, &cfg)
 }
 
 // ToDB exports a IssuesConfig to a serialized format.
@@ -102,7 +102,7 @@ type PullRequestsConfig struct {
 
 // FromDB fills up a PullRequestsConfig from serialized format.
 func (cfg *PullRequestsConfig) FromDB(bs []byte) error {
-	return jsonUnmarshalIgnoreErroneousBOM(bs, &cfg)
+	return jsonUnmarshalHandleDoubleEncode(bs, &cfg)
 }
 
 // ToDB exports a PullRequestsConfig to a serialized format.